iBATIS存儲(chǔ)過(guò)程

使用iBATIS配置來(lái)調(diào)用存儲(chǔ)過(guò)程。為了理解這一章，首先需要了解我們是如何在MySQL中創(chuàng)建一個(gè)存儲(chǔ)過(guò)程。

在繼續(xù)對(duì)本章學(xué)習(xí)之前，可以通過(guò)MySQL存儲(chǔ)過(guò)程。 

我們已經(jīng)在MySQL下有EMPLOYEE表：

CREATE TABLE EMPLOYEE (
   id INT NOT NULL auto_increment,
   first_name VARCHAR(20) default NULL,
   last_name  VARCHAR(20) default NULL,
   salary     INT  default NULL,
   PRIMARY KEY (id)
);

讓我們?cè)贛ySQL數(shù)據(jù)庫(kù)中創(chuàng)建以下存儲(chǔ)過(guò)程。

DELIMITER $$

DROP PROCEDURE IF EXISTS `testdb`.`getEmp` $$
CREATE PROCEDURE `testdb`.`getEmp` 
   (IN empid INT)
BEGIN
   SELECT * FROM EMPLOYEE
   WHERE ID = empid;
END $$

DELIMITER;

考慮EMPLOYEE表是有兩條記錄如下：

mysql> select * from EMPLOYEE;
+----+------------+-----------+--------+
| id | first_name | last_name | salary |
+----+------------+-----------+--------+
|  1 | Zara       | Ali       |   5000 |
|  2 | Roma       | Ali       |   3000 |
+----+------------+-----------+--------+
2 row in set (0.00 sec)

Employee POJO 類:

使用存儲(chǔ)過(guò)程，你就需要修改Employee.java文件。因此，讓我們保持它，因?yàn)樗窃谇耙徽隆?/p>

public class Employee {
  private int id;
  private String first_name; 
  private String last_name;   
  private int salary;  

  /* Define constructors for the Employee class. */
  public Employee() {}
  
  public Employee(String fname, String lname, int salary) {
    this.first_name = fname;
    this.last_name = lname;
    this.salary = salary;
  }

 /* Here are the required method definitions */
  public int getId() {
    return id;
  }
  public void setId(int id) {
    this.id = id;
  }
  public String getFirstName() {
    return first_name;
  }
  public void setFirstName(String fname) {
    this.first_name = fname;
  }
  public String getLastName() {
    return last_name;
  }
  public void setlastName(String lname) {
    this.last_name = lname;
  }
  public int getSalary() {
    return salary;
  }
  public void setSalary(int salary) {
    this.salary = salary;
  }

 } /* End of Employee */

Employee.xml 類:

在這里，我們將修改Employee.xml文件介紹<procedure></procedure>和<parameterMap></parameterMap>標(biāo)記。這里<procedure></procedure>標(biāo)簽將有一個(gè)id，我們會(huì)用我們的應(yīng)用程序來(lái)調(diào)用存儲(chǔ)過(guò)程。

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE sqlMap 
PUBLIC "-//ibatis.apache.org//DTD SQL Map 2.0//EN"
"http://ibatis.apache.org/dtd/sql-map-2.dtd">

<sqlMap namespace="Employee">

<!-- Perform Insert Operation -->
<insert id="insert" parameterClass="Employee">
   INSERT INTO EMPLOYEE(first_name, last_name, salary)
   values (#first_name#, #last_name#, #salary#)

   <selectKey resultClass="int" keyProperty="id">
      select last_insert_id() as id
   </selectKey>

</insert>

<!-- Perform Read O